What type of epoxy did you use, and how did you know it would be non toxic? Could aquarium silicone be used for the whole job? Would it bind to the pipe and hold the SS granules in place as well as an epoxy?
I also wonder, with the length that you made that cave, if you will ever have to worry about if fouling up inside. If wasted products drift about the substrate and eventually find their way inside your cave, would they get trapped toward the back and eventually build up to toxic levels? I guess you could siphon it from time to time with a flixible piece of tubing but if you ever had breeding fish, eggs, or fry in there it might prove to be difficult. Has anyone experienced this problem? Do you think it would even be a problem?
I like this idea very much and might just have to try out a few for my ABN's and future dwarf cichlids.
It may be that your sole purpose in life is simply to serve as a warning to others.
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50 Gallon Aquarium - Colony of Showa Koi Swords.
90 Gallon Planted Aquarium - Yellow Tiger Endlers, Pair of Bristlenose,
Six "oops" Five L15
12x10 Gallon Tanks - Guppies, Apistos, Endlers, Shrimp, Swords, you name it.